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Degaussing wand

Discussion in 'Hobby Electronics' started by JERD, Oct 4, 2007.

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  1. JERD

    JERD Guest

    Anyone suggest a place to purchase a degaussing wand? Had someone place a
    large speaker right in front of a monitor screen for several days and
    switching the monitor on/off several times is not automatically degaussing

  2. Phil Allison

    Phil Allison Guest


    ** WES Components in Ashfield sell them.

    But any repair shop would have one - so why not take the darn thing to one

    ....... Phil
  3. Not sure where you're located, but WES (Wagner Electronic Services) in
    Ashfield, NSW has them.
  4. Franc Zabkar

    Franc Zabkar Guest

    The trade price for a degaussing wand is around $80.

    If your job is a one-off thing, then I'd try disconnecting the
    monitor's degaussing coil and hooking it up to 240V via a series 100W
    incandescent lamp, or two such lamps in parallel.

    You could also try some of these tricks:

    - Franc Zabkar
  5. ian field

    ian field Guest

    At some point you have to switch that jig off, if that happens at any point
    other than zero crossing it leaves a magnetic polarisation on the
    shadowmask, what I use is a degauss coil from a scrap monitor and a variac,
    the variac should be carefully turned up until the coil held close to the
    screen produces strong visible distortion and moved around to disperse the
    magnetisation, then either slowly withdraw the coil away from the screen or
    slowly turn down the variac, after that the picture should be OK.
  6. Franc Zabkar

    Franc Zabkar Guest

    You're right. Sorry.
    I suspect the OP is asking about a one-off job, in which case a variac
    may be too expensive.
    What about wiring an on/off switch across the PTC and adding a lamp
    load between the PCB's degaussing coil connector and the coil itself?

    - Franc Zabkar
  7. ian field

    ian field Guest

    A good alternative is to find a suitable power resistor to put in series
    with a salvaged coil, the important thing is that the magnetic field is
    reduced slowly as can be done by moving the coil away.
    If the rogue magnetisation isn't too severe, possibly a simpler tactic would
    be temporarily wire a second posistor in parallel with the one on the PCB,
    its likely that the mains fuse will also have to be temporarily upgraded.
    There is one significant risk to avoid, the common 3-pin posistors usually
    have 2 PTC elements - the one in series with the degauss coil and a second
    directly across the mains to heat the first above it's knee temperature.
    Some manufacturers (especially Philips) occasionally use PTC/NTC parts, the
    usual PTC in series with the coil plus a NTC in series with the mains feed
    to the rectifier, any salvaged posistor should be checked for both PTC
    (unless the original itself is PTC/NTC). It might take several goes and the
    posistors take about 6 minutes to cool down each time.
  8. kreed

    kreed Guest

    You will have to leave the monitor off for some time between attempts
    (say 10 minutes.) If the monitor is one that you can disconnect the
    mains, then reconnect it and monitor will turn on without needing the
    power button pressed, you could buy one of those cheap mechanical
    appliance timers from bunnings for under $10, set it to turn on for 15
    min then off for 15 min repeatedly and leave it run the monitor

    In my experience, especially with severe distortion (that sounds like
    what you have there) a degaussing wand is the way to go, however with
    the end of CRT technology in sight, it will be something you have no
    use for in the future.

    Here are a couple of sources that might end up cheaper than the WES
    one mentioned elsewhere. A degaussing wand will do the job much
    better/faster than the inbuilt coil every time in my experience.
  9. kreed

    kreed Guest

    Even better - here is one for $25 ! (+$5 postage)
    I dont think you will do better than that anywhere.
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